Andersen, Per Sveaas <br/><br/>
West ward is the course of empires :  a study in the shaping of an American idea : frederick Jackson turner's frontier / 
Per Sveaas Andersen 
 - Oslo :  The University Press,  1956 
 - 133 p. ;  23 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>America--Discovery and exploration
<br/><br/><label>Dewey Class. No.: </label>973.072